labor vs grind

labor and grind both are nouns.

Word	Noun	Adjective	Verb	Adverb
labor	Yes	No	Yes	No
grind	Yes	No	Yes	No

As nouns, grind is a hyponym of labor; that is, grind is a word with a more specific, narrower meaning than labor:

As verbs, labor and grind are synonyms defined as:

Other synonyms of labor include dig, drudge, fag, labour, moil, toil, travail.

labor (noun)	grind (noun)
productive work (especially physical work done for wages)	the act of grinding to a powder or dust
any piece of work that is undertaken or attempted	hard monotonous routine work
a social class comprising those who do manual labor or work for wages	the grade of particle fineness to which a substance is ground
an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement	an insignificant student who is ridiculed as being affected or boringly studious
concluding state of pregnancy; from the onset of contractions to the birth of a child

labor (verb)	grind (verb)
undergo the efforts of childbirth	reduce to small pieces or particles by pounding or abrading
work hard	make a grating or grinding sound by rubbing together
strive and make an effort to reach a goal	press or grind with a crushing noise
	shape or form by grinding
	created by grinding
	dance by rotating the pelvis in an erotically suggestive way, often while in contact with one's partner such that the dancers' legs are interlaced
	work hard